Here presented is a simple DIY Emergency Light which can be charged by your 5v mobile charger.
It is easy to make not much complicated. This can be your very first project as it includes some very simple circuits of electronics as voltage dividing circuit, joule thief, etc.
Its container or cabinet is cardboard box in which we have to make a flashlight..
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Step 1: Gather Materials!!!
1. BC548 Transistor
2. 1k Resistors
3. 2k2 Resistor
4. Ferrite Bead
6. 2 AA Rechargeable Cells
7. USB Female Type A port
8. Type A Male to Male USB Cable
9. Cell Holder
10. Cardboard Box
12. Two Ultra bright White LEDs
Step 2: Making Lighting System
Our Lighting System is a Joule Thief. But Before making Joule thief you should be ready with your Toroid!!!!!
Step 3: Making a Toroid
You will need a Ferrite Bead and then wind two wires in it as shown in Image 1.
Then connect two ends of wire as shown in Image 2.
Your Toroid is ready to be placed in the circuit.
Step 4: Function of a Toroid
Toroid here acts a Simple Step up Transformer.
As you know Power=Voltage x Current(P=VI)
As the Toroid increases the current simultaneously Current Decreases and as a Result the power remains Constant.
Step 5: Circuit
Assemble the components on The General Purpose Circuit Board and your lighting system is Ready.
Step 6: Making Charging Circuit
Our Charging Circuit is a voltage dividing Circuit which works on two resistors.
Assemble the Components as shown in Image and your charging circuit would be ready!!!
Step 7: Adding USB Port
Attach the input part to a Female USB A type Port.
Step 8: Making Holes
Make holes with scissors for switch and two LEDs. Take Care while Doing this work if you are working for the first time in Cardboard.
Step 9: Assembling
Assemble all your parts and circuits in the cardboard box. My cardboard box was small but you can take big one for your convinience.
Step 10: Charging
You can charge it via USB Male A to A Cable from Mobile Charger.